Machine fob cutting plates ob



'unir MAHLON GREGG, F WILMINGTON, DELAWARE.

MACHINE FOR C 'U'TTING PLATES OR SHEETS OF METAL.

T0 all whom it may concern Be it known that aI, MAI-iLoN GREGG, of -Wilmington city, in the county of Newcastle and State of Delaware, have invented a new and Improved Mode of Cutting` Plate or Sheet Tin, Copper, Iron, or other Metals, which is described as follows, reference being had to the annexed drawings of the same, making' `part of this specification.

Figure l is a front elevation of the "maf chine. Fig. 2 is a view of the way, carriage and revolving rest detached from the frame A. Fig. 3 is a view of a straight guide detached from the graduated arm a.. Fig. 4 vertical cross section of frame A on the dotted line :a a2 of Fig. l, showing the side of the graduated arm a and the way, car riage, and revolving rest shown in Fig. 2, in its working position as connected with the frame A. i

Similar letters refer to corresponding parts.

I provide a strong frame, such as that represented in the annexed drawing marked A in which frame I place two parallel shafts B B2 each with a spur wheel C C2 of the saine dimensions at one end and geared into each other as represented in the drawings,

. and at the other ends of said shafts I attach or fix two circular steel plates D D2 or cutters, each of the same diameter their peripheries passing by each other. The upper shaft I secure from any motion endwise. To the lower shaft I apply a spring E and set screw F with the spring pressing against the center of the shafts to keep the lower cutter against the side of the upper cutter. I also apply a screw Gr to the block containing the box of the upper shaft for the purpose of raising and lowering the upper cutter when necessary. The cutters I put in motion with a crank H on the lower shaft.

`The clamps for holding the sheet-s to be cut are made as follows: Two plates I I be tween which the sheets are clamped are secured to the ends ofthe two vertical revolving spindles J J arranged in a sliding frame K, the lower spindle turning on a steel. point L resting upon the long end of a lever M turning on a horizontal pin V as its fulcrum whose short end is raised or lowered by a milled screw N attached to and turning in said sliding frame K for the purpose of raising or lowering the under clamp plate7 the upper plate having no vertical movemeut but turning horizontally in the inanner of the lower plate when the sheet is turned. This sliding frame K containing the revolving clamp plates I I is provided with a pinion` P whichworks into a stationary rack O on the head of the main frame A, said pinion being turned by a` crank Q for the purpose of bringing the sheet to'be cut nearer to, or removing it farther from the cutters D at pleasure, in changing the radius of the curve, when circles are cut the length of which being determined by a scale S onthe top of the main frame A and an index or finger R on the sliding frame, and a scale of parts on the horizontal arm ci standing at right angles to the frame K.

A set screw T passes through a part of the sliding frame being screwed against .the

main frame A for holding the sliding frame to any required position and preventing its moving to the right or left.

In cutting a sheet of metal to a circle of any given radius determined by the scales before mentioned the sheet must first be clamped between the plates I I by the lever M and milled screw N. Then with the hand the operator brings the sheet around horizontally between t-he cutters D D2 which cut off the edges and corners at the same time drawing the sheet around on its center without the aid of t-he operator and cutting the sheet in the forni of a circle.

For cutting sheets of metal to any required angle a way U is formed of two horizontal rails framed together of suitable size and strength is attached to the frame by hooks Z or other suitable fastenings at right angles thereto, on which way a carriage W composed of parallel ribs framed together grooved on the ends to correspond with the shape of the rails of the way over which they slide said carriage W being moved back and forth on the way and on which carriage a horizontally turning rest X is arranged, turning on a vertical center pin Y inserted into said carriage in the center thereof and upon which rests the sheets to be cut are placed having a. horizontal circular movement while the carriage has a longitudinal movement back and forth by which facility of movement the sheet may be brought to the cutters at any angle required. The said revolving rest is provided with a scale of are used the carriage K may be removed from the frame A, the Ways U being hooked to the connecting piece of the frame A2 Fig.

' 4 by hooks Z of the Ways U.

In the use of the horizontally revolving graduated or turning table, represented at X in Figs. 2, and 4, the Ways U must be hooked or otherwise secured to the lower connecting timber A2 of the frame A as `represented in Fig. 4 the carriage W brought opposite the cutters D D2 the rest X turned to the required angle. The sheet of metal placed upon the rest X with one edge againstthe ledge of the rest and another vedge against the cutters, the carriage is then right angles from the sliding frame K for the purpose of receiving a straight stationary guide b hooked, or otherwise secured thereto as seen in Fig. 8 on Which the sheets are placed required to be cut in straight linesor parallel pieces.

For straight cutting it is only necessary to place the sheet of metal upon the said straight guide b and pass it in a straight line between the cutters Which Will draw it for- Ward Without the aid or the operator.

What I claim as my invention and Which I desire to secure by Letters Patent is- The combination of the carriage and turning rest With the circular revolving cutters for cutting sheets of metal to any required angle as described.

MAHLON GREGG.

Witnesses:

SAM. l CAULLEY, W. MCAULLEY. 

